Items and Accounts

I'm new to all this accounting stuff ... so be gentle, please. I'd welcome materials to read, web or other.

I'm a sole proprietor consultant. I want to track reimbursable expenses and associate them with invoices. Sometimes, then, I discount them back out.

My CoA looks like this:

5000 Project Related Costs -- COGS

Then I was thinking that I could log the expenses under 5200 (probably expanding to add air hotel and such), and associate them with invoices. (i'm not planning to use jobs)

Advice, please?

Thanks,